PrincipleBased on the principle of thermal theory&comma; there are two resistances in the closed probe&period; One resistance was heated and regarded as detected resistance&comma; the other one was heated and regarded as standard resistance&period; When the medium is flowing&comma; the heat on the heated resistance will be taken away and the resistances' value will be changed&period; The differential resistances value is the basis of determining the flow velocity&period; Feature1&comma; No movable parts&period; 2&comma; Maintenance free&period; 3&comma; Easy installation&period; 4&comma; Suitable for variable diameter demand&period; 5&comma; Switching value can be adjusted continuously&period; 6&comma; Extremely low pressure loss&period; 7&comma; Compact structure&period; 8&comma; LED indicator display flow trend and switch state&period;

After-sales serviceWe promise to deliver the following after-sales service&colon; 1&period; Warranty&colon; The warranty period is 12 months starting from the shipping date&semi; 2&period; Customers will enjoy free repair services for failures found within the warranty due to manufacturing quality&semi; 3&period; For on-site services not arising from manufacturing quality&comma; we shall charge a certain service fee at our discretion based on actual charges incurred such as travel expense&semi; 4&period; We provide paid repair services for meter damages not arising from manufacturing quality issues or meter damages not within the scope of warranty&period;